wayne jackson. kelly sean stewart. and finally dan leonard therrien. contact them. if they ever knew anyone who went by one >> san francisco's police chief greg suhr says the kevin collins case has long haunted both him and his department. new tonight at eight. he spoke with kron-4's terisa estacio about the latest developments. toat a news conference just hours ago, police revealed why therrien refered to by authorities as jackson - an alias is the primary suspect in kevin collins disappearance. >> reporter: earlier, the police chief spoke about speaking with the mother. >> you know, initially, her initial response was that of a pause. because obviously, she lost her son. and once she could wrap her head around the fact and we were provided all of this information >> reporter: the father? >> it is my understanding that he is out of the country. >> pam: the police revealed why kevin collins is his residence. and his ownership of a large, black and dog. and his criminal history we are investigating him as a person of interest in this case. >> pam: joining us now to t